arXiv 1909.124302019-09-26astro-ph.CO

从21厘米线看物理宇宙学

Physical Cosmology From the 21-cm Line

Steven R. Furlanetto

备注：: To appear as a book chapter in "The Cosmic 21-cm Revolution: Charting the first billion years of our Universe," Ed Andrei Mesinger (Bristol: IOP Publishing Ltd) AAS-IOP ebooks http://www.iopscience.org/books/aas

摘要：

我们描述了如何高红移21厘米的背景可以用来提高我们的理解的基本宇宙学参数，我们的宇宙和奇异的过程起源于黑暗部门。在宇宙学的黑暗时代，在氢重组和第一个发光源（可能在z ~ 30）形成之间的时代，出现的21厘米背景很难测量，但为这些目的提供了几个强大的优势：除了缺乏天体物理污染外，它将允许在非常大的体积上进行非常小尺度结构的探测。此外，21厘米的背景对星系间氢的热状态很敏感，因此可以探测任何外来过程（包括，例如，暗物质散射或衰变和原始黑洞）在那个时代。在天体物理源形成之后，可以通过诸如红移空间畸变、联合建模以及通过寻找对天体物理源本身的间接影响等方法将宇宙学信息与21厘米背景上的天体物理效应分离。

英文摘要：

We describe how the high-redshift 21-cm background can be used to improve both our understanding of the fundamental cosmological parameters of our Universe and exotic processes originating in the dark sector. The 21-cm background emerging during the cosmological Dark Ages, the era between hydrogen recombination and the formation of the first luminous sources (likely at z ~ 30), is difficult to measure but provides several powerful advantages for these purposes: in addition to the lack of astrophysical contamination, it will allow probes of very small scale structure over a very large volume. Additionally, the 21-cm background is sensitive to the thermal state of the intergalactic hydrogen and therefore probes any exotic processes (including, e.g., dark matter scattering or decay and primordial black holes) during that era. After astrophysical sources have formed, cosmological information can be separated from astrophysical effects on the 21-cm background through methods such as redshift space distortions, joint modeling, and by searching for indirect effects on the astrophysical sources themselves.

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